The paper reviews author's own results obtained on heterostructures (HS) of CdSSe with organic photosensitive films, the attention being given to processes of carrier recombination, to the formation of potential barriers near the interface, and to the effect of oxygen. Photochemical processes near top electrodes are discussed. Experimental results characterizing parameters of barriers in such HS are compared with the energy diagram of ionized states and the Anderson model. It is shown that HS can be successfully used for construction of improved organic gas sensors.